MORPHOLOGY AXD EVOLUTION
<t5g*. 4 and «» , which can be arranged in three groups. Most distally lie the terminal digital pads, which give an expanded appearance to the ends of the digits. On the heads of the metacarpal bones lie the tour intermediate or interdigital pads. And two pads over the proximal parts of the hands and feet constitute the third group. All pads may be quite separate, or there may be a variable amount of fusion between the pads of the intermediate
FIG. 1.—A, foot, and B, hand of Lemur macaco, x §. 1-4, the intermediate pads; I, II, the proximal pads (Pocock).
and proximal groups, and between the individual pads in each group. But besides these pads the epidermis is nodulated.
The surfaces of the pads and other elevations are traversed by papillary ridges, on which may be seen the orifices of the ducts of sweat glands. The ridges are arranged in loops, concentric circles or oblique lines. When the characters of the papillary ridges are com-